Both the inquiline, C. latiferreana, and its parasitoid,

B. nucicola, were associated with galls that developed later in the season (Tables 2, 3). The majority of filbert moths emerged from the galls from July through early September of the first year of gall development, though some moths (and their parasitoids) diapaused for a year (Fig. 2). In order to emerge late-summer, see more the inquiline and its parasitoid would need to develop in the early-developing oak apple galls (Fig. 2). As the oak apple galls appear to have a curious bimodal pattern of development throughout the summer and fall (Fig. 2, Rosenthal and Koehler 1971b; Schick 2002), it is likely that the first cohort of galls is more often attacked by the inquiline and subsequently inhabited by B. nucicola, the parasitoid of the inquiline. But why do filbert moths emerge so early from their host galls? Filbert moths inhabit oak

apple galls and acorns on valley oak as well as other nuts and woody oak galls such as Bebiscus mirabilis on Oregon oak (Dohanian 1942b), and they overwinter as free-living, mature larvae after pushing themselves out of their larval host. The pattern of emergence of filbert moths from oak apple galls suggests that the moths may use the galls as an early season host, and thus maintain an additional generation per year. After emerging from galls in August, they likely oviposit in immature acorns, which are a more abundant resource in August than developing oak apple galls. Interestingly,

the parasitoid, Bassus nucicola, www.selleckchem.com/products/BKM-120.html has only been reared from filbert moth larvae inside oak apple galls (Dohanian 1942a); this observation suggests that oak apple galls are a common and important host of filbert moths. What do different attack rates of parasitoids on galls mean for the phenology of the galls? Galls that emerge early in the season accumulate higher abundances of inquilines, which can incur a fitness cost on the gall-inducer Org 27569 by cutting off the plant vasculature that leads to the gall inducer chambers. Conversely, galls that emerge later in the summer are more frequently parasitized by the eulophid parasitoid, B. gigas. Though this study cannot directly assess the selection pressures on the gall-inducer, as we do not know how many gall-inducers were present in the gall prior to parasitoid attack, other studies have found that attack by different predators or parasitoids result in stabilizing selection on aspects of gall morphology such as size (Weis et al. 1992). Interestingly, most parasitoids and inquilines had both a broader emergence period and a longer diapause time than the gall-inducer (Fig. 2). Many of the parasitoids in this system are known to attack other gall species than A. quercuscalifornicus. Inouye and Agrawal (2004) showed that T. californicus and B. gigas (described as Baryscapus sp.) attack the gall wasp Disholcaspis eldoradensis, which forms stem galls on Q. lobata that are sympatric with A.